Juggler Bob is doing an outside throw with every third ball thrown from his right hand."

In Part II
you learned that each throw should go underneath the previous throw.
Your first trick is to throw the ball to the outside, or over top, of the previous throw.
In the animation at the left, watch how the blue ball goes over top of all the other balls. Keep in mind;

The blue ball is thrown at the same time as it's usually thrown.

The blue ball is caught at the same time as it's usually caught.

The blue ball is caught in the same place as it's usually caught.

The big difference is that you reach out a little, and then hook the ball over the top.

Pick a ball, and try to get the ball over the top every time if is thrown from your dominant hand. Then try it from your other hand.

You will see that a number of other tricks described in this site are based on this move.
By changing when you make an outside throw, there are a number of patterns that can be done.
Instead of throwing every third (blue) ball from the right hand, try throwing every other ball.